If you are looking at that pic tom posted, the length and width of it is about 35’X20’ based on people and object height. For math-ez, let’s just say 50X20, or 1000 square feet. Now picture that surface area moving towards you as a solid wall of water at 1 foot per second. That’s 1000 cubic feet per second of water.
Pulling what I think is a reasonable number off the top of the dome of 20 feet per second (bit over 13 mph), that area would produce a flow of 20,000 cubic feet per second on a not seriously inclined slope.
Hopefully that gives a bit of perspective when you hear numbers like the 20,000-50,000 cfs going over the thrashed spillway, or the potential to have as much as 200,000 cfs coming out of the damaged overflow spillway come next rain (along with a betting pool on how long those 4,000 pound plastic bags of rocks will last).
If they were to let folks back in and parts of the dam still fail afterward, there will be a LOT of very VERY pissed off red county citizens.